<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">

    {% block title %}
        <title>框架</title>
    {% endblock %}
    {% block css %}{% endblock %}
</head>
<body>
<a>标签1</a>
<a>标签2</a>
<a>标签3</a>
<h1>--- 继承的顶部 ---</h1>


{% block body %}
{% endblock %}

<h1>---继承的底部--- </h1>

    {% block js %}{% endblock %}
</body>
</html>